Brad Nathanson has been named senior managing director at Calabasas-based Institutional Property Advisors, a division of Marcus & Millichap Inc. Nathanson previously served as executive vice president at CBRE in Los Angeles. Before CBRE, he was first vice president and senior director for Marcus & Millichap’s National Retail Group. “Brad is a nationally recognized shopping center investment expert with a substantial history of successfully advising institutional and private clients,” Scott Holmes, national director at IPA Retail, said in a statement. The former CBRE executive has closed more than $3 billion in shopping center sales during his career, with special expertise in the Pennsylvania, New Jersey, and Delaware markets. Shares of Marcus & Millichap Inc. (MMI) closed Thursday down 1 cent, or a fraction of a percent, to $34.88 on the New York Stock Exchange.